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Arrangement for injecting a reductant into an exhaust line of an internal combustion engine

a technology of reducing agent and combustion engine, which is applied in the direction of engine components, machines/engines, mechanical apparatus, etc., can solve the problems of ammonia, isocyanic acid and water vapour formation

Inactive Publication Date: 2013-07-25
SCANIA CV AB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patent relates to a system for reducing nitrogen oxidates in the exhaust gas of an engine. The technical effects of the patent include the advantages of injecting a reducing agent upstream of the second turbine to increase the energy content of the exhaust gases and to form a more homogeneous mixture of ammonia and exhaust gases. Additionally, the patent proposes a bypass line with a valve to allow for higher exhaust temperature in the region where the reducing agent is injected. The system also includes a control unit that receives information from temperature sensors and opens the valve accordingly to ensure proper functioning of the SCR catalyst.

Problems solved by technology

Vaporisation of AdBlue results in the formation of ammonia, isocyanic acid and water vapour.

Method used

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  • Arrangement for injecting a reductant into an exhaust line of an internal combustion engine
  • Arrangement for injecting a reductant into an exhaust line of an internal combustion engine

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Embodiment Construction

[0016]FIG. 1 depicts a combustion engine in the form of a diesel engine 1. The engine 1 may be intended to power a heavy vehicle. The exhaust gases from the cylinders of the engine 1 are led via an exhaust manifold 2 to an exhaust line 3. The exhaust line 3 is provided with a turbo unit which comprises a turbine 4 and a compressor 5. The turbine 4 is intended to convert the energy of the exhaust gases in the exhaust line 3 to mechanical work for driving the compressor 5. A bypass line 6 extends round the turbine. By means of a valve 7, exhaust gases can be led through the bypass line 6 and thus past the turbine. The compressor 5 is intended to compress air which is led into an inlet line 8 to the diesel engine 1. A charge air cooler 9 is provided in the inlet line 8 to cool the compressed air. The engine 1 comprises a return line 11 for recirculation of exhaust gases. An EGR valve 12 is adapted to regulating the amount of exhaust gases which is led through the return line 11 from th...

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PUM

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Abstract

An arrangement for injecting a reducing agent into an exhaust line of a combustion engine (1). An exhaust line (3) leads exhaust gases from the engine. A first turbine (4) is in the exhaust line (3). A second turbine (20) in the exhaust line is downstream of the first turbine (4) in the intended direction of flow in the exhaust line. An injector (19) injects reducing agent into the exhaust line (3) so that it is warmed and vaporised by the warm exhaust gases in the exhaust line (3), and an SCR catalyst (29). The injector (19) is in the exhaust line downstream of the first turbine (4) and upstream of the second turbine (20).

Description

BACKGROUND TO THE INVENTION AND PRIOR ART[0001]The invention relates to an arrangement for injecting a reducing agent into an exhaust line of a combustion engine according to the preamble of claim 1.[0002]Today, many combustion engines and the majority of diesel engines are provided with a turbo unit. A turbo unit comprises an exhaust-powered turbine driving a compressor which compresses air in an inlet line to the engine. Air is thus supplied at a positive pressure to the engine's combustion spaces. A large amount of air and fuel can thus be supplied to and burnt in the engine. An engine with turbo can therefore produce a significantly higher power output than a similar engine with no turbo. The amount of power which the turbine can extract from the exhaust gases in order to drive the compressor is substantially related to the pressure drop of the exhaust gases across the turbine.[0003]One way of reducing emissions of nitrogen oxides from diesel engines is to use a technique called...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F01N5/04
CPCF01N3/2066Y02T10/16F01N2610/02F01N2610/102F02B37/18F02B41/10Y02T10/24F01N5/04F02B37/004F01N2240/40F01N2340/06F01N3/208F01N2560/06F01N2560/14F01N2900/0416F01N2900/1404Y02T10/144F01N3/2073Y02T10/12F02B37/013F01N2610/1453
Inventor SARBY, HAKAN
Owner SCANIA CV AB